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Cobalt disulfide-tin disulfide composite particle and preparation method and application thereof

A technology of cobalt disulfide and tin disulfide, used in secondary batteries, electrochemical generators, active material electrodes, etc., can solve problems such as poor conductivity, limited popularization and application, and achieve reduced volume expansion, high mobility, and volume. Small swelling effect

Active Publication Date: 2020-09-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that metal sulfides have good mechanical and thermal stability, so they have excellent electrochemical properties, and are considered to be very promising anode materials for sodium-ion batteries. Huge volume expansion will occur, and its poor conductivity limits its popularization and application in sodium-ion batteries

Method used

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  • Cobalt disulfide-tin disulfide composite particle and preparation method and application thereof
  • Cobalt disulfide-tin disulfide composite particle and preparation method and application thereof
  • Cobalt disulfide-tin disulfide composite particle and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of cobalt disulfide-tin disulfide composite particle, its preparation method comprises the following steps:

[0035] 1) 291.0mg of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 328.4mg of 2-methylimidazole (the molar ratio of cobalt nitrate hexahydrate and 2-methylimidazole is 1:4) were dispersed in 20mL of methanol, stirred evenly, left standing at room temperature for 24h, centrifuged, and washed with methanol Precipitate the product 3 times, and dry it in vacuum at 60°C for 3 hours to obtain the zeolite imidazolate framework material (ZIF-67);

[0036] 2) Mix 150mg of zeolite imidazolate framework material and 300mg of sulfur powder evenly, place in nitrogen atmosphere, raise the temperature to 600°C at a rate of 2°C / min, and vulcanize at constant temperature for 3 hours to obtain cobalt disulfide particles;

[0037] 3) Disperse 40mg of cobalt disulfide particles in 40mL of ethanol, then add 112.7mg of thioacetamide to obtain solution A, and 263.0mg ...

Embodiment 2

[0039] A kind of cobalt disulfide-tin disulfide composite particle, its preparation method comprises the following steps:

[0040] 1) 291.0mg of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 328.4mg of 2-methylimidazole (the molar ratio of cobalt nitrate hexahydrate and 2-methylimidazole is 1:4) were dispersed in 20mL of methanol, stirred evenly, left standing at room temperature for 24h, centrifuged, and washed with methanol Precipitate the product 3 times, and dry it in vacuum at 60°C for 3 hours to obtain the zeolite imidazolate framework material (ZIF-67);

[0041] 2) Mix 150mg of zeolite imidazolate framework material and 300mg of sulfur powder evenly, place in nitrogen atmosphere, raise the temperature to 600°C at a rate of 2°C / min, and vulcanize at constant temperature for 3 hours to obtain cobalt disulfide particles;

[0042] 3) Disperse 40 mg of cobalt disulfide particles in 20 mL of ethanol, then add 56.3 mg of thioacetamide to obtain solution A, and 263.0 ...

Embodiment 3

[0044] A kind of cobalt disulfide-tin disulfide composite particle, its preparation method comprises the following steps:

[0045] 1) 291.0mg of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 328.4mg of 2-methylimidazole (the molar ratio of cobalt nitrate hexahydrate and 2-methylimidazole is 1:4) were dispersed in 20mL of methanol, stirred evenly, left standing at room temperature for 24h, centrifuged, and washed with methanol Precipitate the product 3 times, and dry it in vacuum at 60°C for 3 hours to obtain the zeolite imidazolate framework material (ZIF-67);

[0046] 2) Mix 150mg of zeolite imidazolate framework material and 300mg of sulfur powder evenly, place in nitrogen atmosphere, raise the temperature to 600°C at a rate of 2°C / min, and vulcanize at constant temperature for 3 hours to obtain cobalt disulfide particles;

[0047]3) Disperse 40mg of cobalt disulfide particles in 60mL of ethanol, then add 169.0mg of thioacetamide to obtain solution A, and 263.0mg o...

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Abstract

The invention discloses cobalt disulfide-tin disulfide composite particles and a preparation method and application thereof. The preparation method of the cobalt disulfide-tin disulfide composite particles comprises the following steps: 1) dispersing a soluble cobalt salt and 2-methylimidazole in a solvent, and fully reacting to obtain a zeolite imidazolate framework structure material; 2) uniformly mixing the zeolite imidazate skeleton structure material and sulfur powder, putting the mixture into a protective atmosphere, and heating for vulcanization to obtain cobalt disulfide particles; 3)dispersing cobalt disulfide particles in a solvent, adding soluble tin salt and thioacetamide, and carrying out solvothermal reaction. The cobalt disulfide-tin disulfide composite particles are prepared into the sodium ion battery negative electrode material, and the sodium ion battery negative electrode material is assembled into the sodium ion battery. The cobalt disulfide-tin disulfide composite particle is good in conductivity and simple in preparation process, and when the cobalt disulfide-tin disulfide composite particle is used as a negative electrode material of a sodium-ion battery, the mobility of sodium ions is high, and the volume expansion in the charging and discharging process is small.

Description

technical field [0001] The invention relates to a cobalt disulfide-tin disulfide composite particle and a preparation method and application thereof, belonging to the technical field of sodium ion batteries. Background technique [0002] With the massive exploitation and use of fossil energy such as coal, oil, and natural gas, the problem of environmental pollution is becoming more and more serious, and it will not be long before we will face the severe challenge of energy depletion. Therefore, there is an urgent need to develop clean energy sources such as solar energy, wind energy, and tidal energy. However, the intermittency of this type of energy will seriously interfere with the normal operation of the smart grid, and the development of stable and reliable energy storage devices is the key to achieving sustainable and stable output of clean energy. [0003] Lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental friendliness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/054
CPCH01M4/362H01M4/5815H01M10/054H01M2004/027Y02E60/10
Inventor 范浩森李晓彤刘芝婷杨伟郑文芝
Owner GUANGZHOU UNIVERSITY
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